Myth: The inverter selection only needs to consider the load power
When purchasing a frequency converter, many users usually only match the capacity of the frequency converter based on the power of the drive motor. In fact, the load driven by the motor is different, and the requirements for the inverter are also different.
Harm
Because of the difference in the load characteristics of the electric motor, if the inductive factors are not fully considered, it may cause damage to the inverter due to improper use, and at the same time, it may cause safety risks because it is not equipped with the necessary braking unit and filter.
Resolution
According to the characteristics and type of load, the capacity and configuration of the inverter are reasonably selected:
1) Fans and pumps are the most general loads
The requirements for the inverter are the simplest, as long as the inverter capacity is equal to the motor capacity (air compressors, deep water pumps, sediment pumps, and rapidly changing music fountains need to increase their capacity);
2) Crane loads
This type of load is characterized by a large impact at start-up, which requires a certain margin of the inverter. At the same time, when the elbow is placed under the heavy object, there will be energy feedback, so it is necessary to use the braking unit or choose the common bus method;
3) Uneven load
Some loads are sometimes light and sometimes heavy, and the capacity of the inverter should be selected according to the condition of the heavy load, such as rolling mill machinery, crushing machinery, mixer, etc.;
4) Large inertial load
For example, centrifuges, punches, and rotary kilns in cement plants, such loads have a large inertia, so they may oscillate when starting, and there is energy feedback when the motor decelerates. A slightly larger inverter should be used to speed up start-up, avoid oscillation, and cooperate with the braking unit to eliminate the regenerative energy.
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